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US 2008/0074618 A1Published application
Fatigue detection device using encoded light signals
OwnerBaohua Qiinventor
Life of this patent
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Abstract
A method and apparatus for detecting fatigue level. According to this method, eyelid movement and eye reflectivity are measured simultaneously by using encoded light signals. Eye reflectivity is used to detect early fatigue while eyelid movement is used for monitoring late fatigue. For more accurately and reliably measuring reflectivity, the emitting light intensity is adjusted according to background light conditions. Devices based on this invention can work during both daytime and nighttime.
Claims17
An apparatus for detecting fatigue, said apparatus comprising:
- a light emitter for generating light pulses that include an ID (identification) code;
- a receiver for receiving and processing reflected light signals that is generated by said light emitter and reflected by human eyes;
- in said receiver, said ID code obtained from said reflected light signals is used to calculate eye open time and eye closure time, while the pulse height of said reflected light signals is used for calculating reflectivity of eyes.
An apparatus for detecting fatigue, said apparatus comprising:
- a light emitter for generating light pulses that include an ID code and an information code;
- a receiver for receiving and processing reflected light signals that is generated by said light emitter and reflected by human eyes;
- in said receiver, said ID code obtained from said reflected light signals is used to calculate eye open time and eye closure time, while the pulse height of said reflected light signals is used for calculating reflectivity of eyes.
Dependencies are inferred from the claim text.